Hello, I'm brand new to this forum, even newer to home audio. Probably most of what I know, I learned by skimming this forum. I plan on setting up a moderately nice audio system for my dorm room using my computer, I lack a TV and stand-alone DVD player. I have a Creative SoundBlaster Audigy Platinum which looks to have all of the connections I'll need. I was looking at the Klipsch Promedia 5.1 and the Logitech Z-680. I have a number of questions: 1. The Creative Audigy has Dolby Digital processing of it's own, is their optional DD-5.1 decoder then necessary for watching DVDs capable of Dolby Digital? The package is $499, while I can get just the speakers for about $270 brand new. 2. Even if not necessary, would it be worth it for the DTS decoding? Or is that not worth the extra $199. 3. Are the Z-680 the better choice? They have a built in decoder, and are far cheaper. I realize they have had a problem with hissing which looks to have been solved, but I have heard reports that the subwoofer included rattles. 4. Am I better off using seperate pieces for my system, or is it best to use a system out of the box when revolving it around a computer? 5. I saw something about shielding? What exactly is that? Should I be worried if my speakers/subwoofer are close to anything else? (i.e. Monitor, tower, each other?). I'd appreciate it very much if someone or someones were to point me in the right direction, or maybe offer another choice in the 5.1 market. As a college student this is a huge purchase for me, but I don't want to have to settle for a lesser quality system that may need replacing sooner than later. Thank you for any help offered in advance. EDIT: I added Question 4, and 5.